9990909900 has 144 divisors (see below), whose sum is σ = 32437819680. Its totient is φ = 2637792000.

The previous prime is 9990909899. The next prime is 9990909931. The reversal of 9990909900 is 99090999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254382 + ... + 291018.

Almost surely, 2^9990909900 is an apocalyptic number.

9990909900 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9990909900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16218909840).

9990909900 is an abundant number, since it is smaller than the sum of its proper divisors (22446909780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9990909900 is a wasteful number, since it uses less digits than its factorization.

9990909900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36761 (or 36748 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 9990909900 is about 99954.5391665631. The cubic root of 9990909900 is about 2153.7816912386.

The spelling of 9990909900 in words is "nine billion, nine hundred ninety million, nine hundred nine thousand, nine hundred".